The real issue you should address up front is what does the seller want?

That will be an issue if you change it to try and make it contingent on financing.

Quote from @Jaycee Greene: Hi @Chloe Salcedo, welcome to the BP Forum and I'm sorry to hear about your medical issues!

If you made those free they'd be complaining about jobs or supermarket deserts or lack of public transportation or some other issue.

This is really what it should be as unsafe units should have to address the safety issues before they can be rented.  

I think the issue here is how long Dad has been out of work.

Cash offers are often particularly appealing to sellers because they eliminate the uncertainties that come with financing, such as loan approval or appraisal issues.

Based on a quick answer from Perplexity it seems like there would be no issue with you buying the home and collecting passive income, but you may not be allowed to manage it yourself since that is considered active work.

I believe this is the issue at hand its the collateral.when you look at NPN pricing you will see this.. 

Getting them all I same room however would be an issue.